BCD AS431I Low cathode current adjustable precision shunt regulator Datasheet

Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
General Description
Features
The AS431I is a three-terminal adjustable shunt regulator with guaranteed thermal stability over a full
operation range. It features sharp turn-on characteristics, low temperature coefficient and low output
impedance, which make it ideal substitute for Zener
diode in applications such as switching power supply,
charger and other adjustable regulators.
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The output voltage of AS431I can be set to any value
between VREF (2.5V) and the corresponding
maximum cathode voltage (36V).
AS431I
Programmable Precise Output Voltage from
2.5V to 36V
High Stability Under Capacitive Load
Low Minimum Cathode Current for Regulation:
10μA (Typ.), 50μA (Max.)
Low Temperature Deviation: 4.5mV Typical
Sink Current Capacity from 50μ A to 100mA
Low Output Noise
Wide Operating Range: -40℃ to 125℃
Applications
The AS431I is offered in two grade initial voltage
tolerance at 25℃, 0.5%, and 1%.
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This IC is available in 3 packages: TO-92 (bulk or
ammo packing), SOT-23 and SOT-89.
TO-92(Bulk Packing)
Charger
Voltage Adapter
Switching Power Supply
Graphic Card
Precision Voltage Reference
TO-92(Ammo Packing)
SOT-89
SOT-23
Figure 1. Package Type of AS431I
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
1
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Pin Configuration
N Package
(SOT-23)
R Package
(SOT-89)
Z Package
(TO-92 (Bulk Packing))
Z Package
(TO-92 (Ammo Packing))
Figure 2. Pin Configuration of AS431I (Top View)
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
2
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Functional Block Diagram
CATHODE
+
REF
-
VREF
ANODE
Figure 3. Functional Block Diagram of AS431I
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
3
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Ordering Information
AS431I
-
Circuit Type
G1: Green
Voltage Tolerance
A: 0.5%
B: 1.0%
TR: Tape and Reel or Ammo
Blank: Bulk
Package
N: SOT-23
R: SOT-89
Z: TO-92
Package
Temperature
Range
SOT-23
-40 to 125℃
TO-92
SOT-89
Voltage
Tolerance
Part Number
Marking ID
Packing Type
0.5%
AS431IANTR-G1
GB9
Tape & Reel
1.0%
AS431IBNTR-G1
GC9
Tape & Reel
0.5%
AS431IAZ-G1
AS431IAZ-G1
Bulk
0.5%
AS431IAZTR-G1
AS431IAZ-G1
Ammo
1.0%
AS431IBZ-G1
AS431IBZ-G1
Bulk
1.0%
AS431IBZTR-G1
AS431IBZ-G1
Ammo
0.5%
AS431IARTR-G1
G43J
Tape & Reel
1.0%
AS431IBRTR-G1
G43K
Tape & Reel
-40 to 125℃
-40 to 125℃
BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and
Green.
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
4
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Cathode Voltage
VKA
40
V
Cathode Current Range (Continuous)
IKA
-100 to 150
mA
Reference Input Current Range
IREF
10
mA
Power Dissipation
PD
TO-92
770
SOT-89
770
SOT-23
370
mW
TJ
150
°C
Storage Temperature Range
TSTG
-65 to 150
°C
ESD (Human Body Model)
ESD
2000
V
Junction Temperature
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
Cathode Voltage
VKA
VREF
36
V
Cathode Current
IKA
0.05
100
mA
Operating Ambient Temperature Range
TA
-40
125
°C
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
5
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Electrical Characteristics
Operating Conditions: TA=25℃, unless otherwise specified.
Parameter
Reference
Voltage
Test
Circuit
Symbol
4
VREF
Conditions
Min
Typ
Max
2.487
2.500
2.512
2.475
2.500
2.525
4.5
8
-40 to 85 C
4.5
10
o
-40 to 125 C
4.5
16
ΔVKA=
10V to VREF
-1.0
-2.7
ΔVKA=
36V to 10V
-0.5
-2.0
IKA=10mA,R1=10kΩ,
R2=∞
0.035
0.5
μA
0.03
0.3
μA
10
50
μA
0.5%
VKA=VREF, IKA=10mA
V
1.0%
Deviation of
Reference Voltage
Over Full
Temperature Range
0 to 70oC
4
ΔVREF
VKA=VREF
IKA= 10mA
Unit
o
mV
Ratio of Change in
Reference
Voltage to the
Change in
Cathode Voltage
5
Reference Current
5
IREF
5
ΔIREF
IKA=10mA, R1=10kΩ,
R2=∞, TA=-40 to 125 oC
4
IKA
(Min)
VKA=VREF
6
IKA
(Off)
VKA=36V, VREF=0
0.05
1.0
μA
4
ZKA
VKA=VREF,
IKA=1 to 100mA, f≤1.0kHz
0.15
0.5
Ω
Deviation of
Reference Current
Over Full
Temperature Range
Minimum Cathode
Current for
Regulation
Off-state Cathode
Current
Dynamic Impedance
Thermal Resistance
Dec. 2012
ΔVREF
ΔVKA
θJC
IKA=10mA
mV/V
TO-92
68
SOT-89
29
SOT-23
113
Rev. 1. 8
°C/W
BCD Semiconductor Manufacturing Limited
6
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Electrical Characteristics (Continued)
R1
VKA
VIN
IKA
VREF
Figure 4. Test Circuit 4 for VKA=VREF
R3
VIN
VKA
IKA
R1
IREF
VKA=VREF(1+R1/R2)+ IREF*R1
R2
VREF
Figure 5. Test Circuit 5 for VKA﹥VREF
Figure 6. Test Circuit 6 for IOFF
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
7
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Typical Performance Characteristics
0.055
VKA=VREF
IKA=10mA
R1=10K, R2=infinite
IKA=10mA
0.050
Reference Current (μA)
Reference Voltage (V)
2.52
2.51
2.50
2.49
0.045
0.040
0.035
0.030
0.025
2.48
-60
-40
-20
0
20
40
60
80
100
120
140
0.020
-40
0
-20
0
20
Temperature ( C)
60
80
100
120
o
Figure 7. Reference Voltage vs. Ambient Temperature
Figure 8. Reference Current vs. Ambient Temperature
50
120
VKA=VREF
100
VKA=VREF
40
o
80
40
Temperature ( C)
o
TA=25 C
30
TA=25 C
Cathode Current (μA)
Cathode Current (mA)
60
40
20
0
-20
-40
-60
20
10
0
-10
-20
-30
-80
-40
-100
-120
-50
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-1.0
Figure 9. Cathode Current vs. Cathode Voltage
Dec. 2012
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Cathode Voltage (V)
Cathode Voltage (V)
Figure 10. Cathode Current vs. Cathode Voltage
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
8
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Typical Performance Characteristics (Continued)
0.4
VKA=36V
VKA=3.5V to 36V
VREF=0
0.12
0.2
0.10
ΔVREF/ΔVKA (mV/V)
Off-state Cathode Current (μA)
0.14
0.08
0.06
0.04
0.0
-0.2
-0.4
0.02
0.00
-60
-40
-20
0
20
40
60
80
100
120
-0.6
-60
140
0
-40
-20
0
20
40
60
80
100
120
140
0
Temperature ( C)
Temperature ( C)
Figure 11. Off-state Cathode Current vs.
Ambient Temperature
Figure 12. Ratio of Delta Reference Voltage to the
Ratio of Delta Cathode Voltage
Output
60
IKA=10mA
o
50
I KA
Small Signal Voltage Gain (dB)
15K
TA=25 C
242
10μF
8.2K
40
30
20
10
0
-10
-20
GND
-30
1k
10k
100k
300k
Frequence (Hz)
Figure 13. Small Signal Voltage Gain vs. Frequency
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
9
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Typical Performance Characteristics (Continued)
100
90
Cathode Current (mA)
150
R1 (10K)
80
IKA
70
60
Stable
Stable
50
40
30
VKA=VREF
20
VKA=5V
VKA=10V
10
0
R2
VKA>10V, No Oscillation
0.001
0.01
0.1
1
10
Load Capacitor (μF)
Figure 14. Stability Boundary Conditions vs. Load Capacitance
Output
220
Pulse
Generator
f=100KHz
50
GND
Figure 15. Pulse Response of Input and Output Voltage
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
10
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Typical Application
VOUT=(1+R1/R2)*VREF
Figure 16. Shunt Regulator
VOUT=(1+R2/R3)*VREF
Figure 17. High Current Shunt Regulator
IOUT=VREF/R2+IKA
Figure 18. Current Source or Current Limit
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
11
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Typical Application (Continued)
Figure 19. Precision 5V 1A Regulator
Figure 20. PWM Converter with Reference
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
12
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Mechanical Dimensions
TO-92(Bulk Packing)
Unit: mm(inch)
1.000(0. 039)
1.400(0. 055)
3.430(0. 135)
MIN
0.320(0. 013)
0.510(0. 020)
0. 000(0.000)
0. 380(0.015)
Φ1. 600(0. 063)
MAX
4.400(0. 173)
4.800(0. 189)
0.360(0. 014)
0.760(0. 030)
1.270(0. 050)
TYP
Dec. 2012
2.420(0.095)
2.660(0.105)
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
13
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Mechanical Dimensions (Continued)
TO-92(Ammo Packing)
Unit: mm(inch)
4.400(0. 173)
4.800 (0.189 )
1. 100(0. 043)
1. 400(0. 055)
1.270(0. 050)
Typ
3. 430(0.135)
MIN
2.500(0. 098)
4.000 (0.157 )
0. 320(0. 013)
0. 510(0. 020)
0.000(0.000)
0.380(0.015)
13.000(0. 512)
15.000 (0.591 )
Φ1. 600(0. 063)
MAX
0.380(0.015)
0.550(0.022 )
2.540(0.100)
Typ
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
14
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Mechanical Dimensions (Continued)
SOT-23
Dec. 2012
Rev. 1. 8
Unit: mm(inch)
BCD Semiconductor Manufacturing Limited
15
Data Sheet
LOW CATHODE CURRENT ADJUSTABLE PRECISION SHUNT REGULATOR
AS431I
Mechanical Dimensions (Continued)
SOT-89
1.550(0.061)REF
Unit: mm(inch)
4.400(0.173)
4.600(0.181)
1.400(0.055)
1.600(0.063)
1.030(0.041)REF
45
2.300(0.091)
2.600(0.102)
3.950(0.156)
4.250(0.167)
2.060(0.081)REF
3
0.900(0.035)
1.100(0.043)
0.320(0.013)
0.520(0.020)
0.480(0.019)
0.320(0.013)
0.520(0.020)
10
0.350(0.014)
0.450(0.018)
3.000(0.118)
TYP
1.500(0.059)
1.800(0.071)
0.320(0.013)REF
3
1.620(0.064)REF
2.210(0.087)REF
R0.150(0.006)
10
Dec. 2012
Rev. 1. 8
BCD Semiconductor Manufacturing Limited
16
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